Denys

Denys Kibalenko
Python Backend Developer

[відкрити контакти](див. вище в блоці «контактна інформація»)

[відкрити контакти](див. вище в блоці «контактна інформація»)

Prague, Czechia / Remote

SUMMARY
Builds production‑ready backend systems tested under real-world load, designing RESTful APIs with Django and
async FastAPI, and optimizing PostgreSQL databases for performance. Strong foundation in OOP, SOLID
principles, concurrency, and async programming. Experienced with Dockerized multi‑service environments,
AWS, and Linux. Recognized for fast learning, problem‑solving, and effective collaboration in international teams.

SKILLS
PYTHON (CONCURRENCY & PARALLELISM), OOP, SOLID, DJANGO, DJANGO ORM, DJANGO REST, FASTAPI, PYDANTIC,
SQLALCHEMY, ALEMBIC, CELERY, REDIS, POSTGRESQL, WEBSOCKETS, POSTMAN, HTML/CSS, LINUX, AWS, POETRY, DOCKER,
DEBUGGING, LOGGING, PYTEST, GIT, SQL (MODELLING & QUERY OPTIMIZATION), ENGLISH (ADVANCED)

EXPERIENCE
FREELANCE PYTHON DEVELOPER, Mar 2025 - Mar 2026
Technologies: Django, Django REST framework, Django ORM, PostgreSQL, SQL, OOP, GIT, Docker, Swagger.
Responsibilities:
Implemented a scalable RESTful API backend for a CRM platform using Django REST Framework
Built a multi-tenant tracking architecture with strict account isolation & ownership enforcement logic
Integrated with external tracking engine through a custom Python client & built public rate-limited endpoints
Designed relational SQL data models and optimized PostgreSQL queries for performance
Containerized backend services using Docker, enabling reproducible development environments

PYTHON DEVELOPER, Dec 2023 - Mar 2025
Technologies: Django, Django REST, Django ORM, FastAPI, SQLAlchemy, PostgreSQL, SQL, OOP, Git, Nginx, Locust
Responsibilities:
Built an asynchronous FastAPI backend with a clean layered project structure, robust custom authentication
system with JWT, refresh tokens, account activation, & secure password handling, Role-based Access Control
Implemented background task pipeline using Celery for email notifications and account lifecycle events
Designed relational database models & optimized queries using PostgreSQL, Djanog ORM and SQLAlchemy
Containerized applications with Docker, built CI pipelines & deployed applications on Render & AWS

CHIEF OFFICER - Royal Wagenborg HQ, March 2009 - May 2023
Description:
Senior maritime officer responsible for cargo operations, vessel stability, navigation, and safety management
aboard international cargo vessels.

PROJECTS
An Online Cinema Platform: A fully asynchronous backend built with FastAPI, PostgreSQL, SQLAlchemy 2.0,
Pydantic, Alembic, Redis, Celery, Flower, WebSockets, MinIO, CI/CD, Nginx.
A Theatre API Service: An API service for theatre management written on Django REST framework
EDUCATION
Master’s Degree in Navigation & Innovative Technologies
Kherson State Maritime Academy (2004–2010)

ADDITIONAL EDUCATION
MATE ACADEMY - PYTHON DEVELOPER (2023-2025) Books:
Udemy - Python 3: Deep Dive (Functional) Python Tricks. The book, Dan Bader
Udemy - Python 3: Deep Dive (Iterators, Generators) Functional Programming in Python, David Mertz
Udemy - Python Django - The Practical Guide
Udemy - The Complete SQL Bootcamp
LinkedIn Learning - DevOps Foundations

ACHIEVEMENTS LANGUAGES
18 years of international teamwork Ukrainian - Native
Strong communication and leadership background English - Advanced
Typing speed ~60 WPM Russian - Native
Sports achievements (football, athletics)